import com.leocardz.link.preview.library.TextCrawler;
// ...
// Create an instance of the TextCrawler to parse your url into a preview.
TextCrawler textCrawler = new TextCrawler();
// ..
// Create the callbacks to handle pre and post exicution of the preview generation.
LinkPreviewCallback linkPreviewCallback = new LinkPreviewCallback() {
    @Override
    public void onPre() {
        // Any work that needs to be done before generating the preview. Usually inflate 
        // your custom preview layout here.
    }
    @Override
    public void onPos(SourceContent sourceContent, boolean b) {
        // Populate your preview layout with the results of sourceContent.
    }
};

textCrawler.makePreview( linkPreviewCallback, url);

 @Override
    protected void onDestroy() {
        super.onDestroy();
        textCrawler.cancel();
    }